† roche petre Obs.
In 7 rochpeter, rochpeeter, roch-peter.
[f. roche n.1 + petre.]
Native saltpetre, occurring as an efflorescence on rocks.
| 1634 J. B[ate] Myst. Nature 54 The ingredients likewise are chiefly these, Saltpeter, Rochpeter, Sulpher. 1665 Phil. Trans. I. 36 A fine white Salt, which..seemed to have Sides and Angles in the same number and figure as Rochpeeter. 1669 Sturmy Mariner's Mag. v. xiii. 87 Roch-Peter.., Quick-Brimstone.., and fine Powder-dust. |